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Spotted Wing Drosophila Update: 10/10/2014

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David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

drosophila trap

Drosophila Trap, photo by David Handley

Spotted wing drosophila trap captures have increased considerably in most locations this week, although some inland sites are not yet seeing a stable upward trend. We have been anticipating a sustained, sharp increase in fly numbers for some time, and this may be the start of it. Over the past two seasons, we have not seen drosophila numbers decline until after several hard frosts in November. As we mentioned last week, some of the trap count increases may be related to most of the fruit being gone, which makes our traps more attractive to the flies. In spite of the increased numbers of flies, however, we have not been seeing an increase in fruit infestations with larvae. In fact, it has not been easy to find infested fruit in most plantings. Growers who still have berries to harvest have been able to manage drosophila very well with a seven to ten day spray schedule, with no larvae being found in the fruit. We plan to keep monitoring spotted wing drosophila for one more week. Our final planned report will be on October 17th.

Town Spotted Wing Drosophila weekly trap catch 10/10/14 Spotted Wing Drosophila weekly trap catch 10/3/14 Spotted Wing Drosophila weekly trap catch 9/26/14
Limington 127 48 6
Limerick 346 141 195
Wells 6064 558 523
Cape Elizabeth 684 417 401
Bowdoinham * 46 25
Dresden 3075 739 599
Warren 620 211 128
Farmington * 29 23
Livermore Falls * 28 5
Mechanic Falls 15 33 20
Poland Spring 1171 2118 604
Monmouth 66 24 23
Wales * 215 67
Old Town 29 13
Levant 43 31 30

*We’ll update the information for this site as soon as we have finished counting the trap catch.

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

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